Gains from Ported HSR?
Thread Starter
Joined: Apr 2006
Posts: 1,534
Likes: 3
From: Jacksonville, NC
Car: 92 Camaro
Engine: Dart SHP 406 HSR, LE heads
Transmission: Performabuilt Level 2, Vig 3200
Axle/Gears: S60 373
Gains from Ported HSR?
Alright guys, I think I'm getting greedy here. I am thinking about sending my HSR to get ported by Lloyd Elliot so i can see even bigger gains. I'm wanting to hear what people have gained/or not from porting out their HSR. I'm wanting another 30-40cfm out of the intake.
My goals are mid to low 11's NA and slapping 100 shot of NX on there for mid to high 10s. Lloyd already sent me the custom cam and wouldnt you know it, i want more!
My goals are mid to low 11's NA and slapping 100 shot of NX on there for mid to high 10s. Lloyd already sent me the custom cam and wouldnt you know it, i want more!
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: Gains from Ported HSR?
i ported mine but dont have a before/after. I can tell you tho there is alot of material that can be removed, but most importantly there are 4 runners that need reshapened to ease transition of the air column to the head. 4 runners are straight shot into the cylinder head port, the others have a curve to them. If you grind abit on the short side radius you can straighten out that port.
Round off the edges at the top of the runners to ease the air flow into the runners from the plenum.
Port match the manifold side ports to your head port size. There is enough room to really open it up to a true 1205 port size even tho AFR port sizes are slightly different. I know the Eliminators are but the old style i'm not sure which i think is what you have correct?
Main benefits of porting the HSR is to straighten flow to those 4 curved runners but i havent seen before and afters. I have seen from several places that teh HSR out the box flows in the 268-278 range depending on runners/etc. Thats good flow. But since alot of good heads flow in the 270-290 range+ its nice to make sure your intake flows alot more than the head to make the head the limiting factor
Head can only flow as much as the intake manifold lets through
Round off the edges at the top of the runners to ease the air flow into the runners from the plenum.
Port match the manifold side ports to your head port size. There is enough room to really open it up to a true 1205 port size even tho AFR port sizes are slightly different. I know the Eliminators are but the old style i'm not sure which i think is what you have correct?
Main benefits of porting the HSR is to straighten flow to those 4 curved runners but i havent seen before and afters. I have seen from several places that teh HSR out the box flows in the 268-278 range depending on runners/etc. Thats good flow. But since alot of good heads flow in the 270-290 range+ its nice to make sure your intake flows alot more than the head to make the head the limiting factor
Head can only flow as much as the intake manifold lets through
Thread Starter
Joined: Apr 2006
Posts: 1,534
Likes: 3
From: Jacksonville, NC
Car: 92 Camaro
Engine: Dart SHP 406 HSR, LE heads
Transmission: Performabuilt Level 2, Vig 3200
Axle/Gears: S60 373
Re: Gains from Ported HSR?
i ported mine but dont have a before/after. I can tell you tho there is alot of material that can be removed, but most importantly there are 4 runners that need reshapened to ease transition of the air column to the head. 4 runners are straight shot into the cylinder head port, the others have a curve to them. If you grind abit on the short side radius you can straighten out that port.
Round off the edges at the top of the runners to ease the air flow into the runners from the plenum.
Port match the manifold side ports to your head port size. There is enough room to really open it up to a true 1205 port size even tho AFR port sizes are slightly different. I know the Eliminators are but the old style i'm not sure which i think is what you have correct?
Main benefits of porting the HSR is to straighten flow to those 4 curved runners but i havent seen before and afters. I have seen from several places that teh HSR out the box flows in the 268-278 range depending on runners/etc. Thats good flow. But since alot of good heads flow in the 270-290 range+ its nice to make sure your intake flows alot more than the head to make the head the limiting factor
Head can only flow as much as the intake manifold lets through
Round off the edges at the top of the runners to ease the air flow into the runners from the plenum.
Port match the manifold side ports to your head port size. There is enough room to really open it up to a true 1205 port size even tho AFR port sizes are slightly different. I know the Eliminators are but the old style i'm not sure which i think is what you have correct?
Main benefits of porting the HSR is to straighten flow to those 4 curved runners but i havent seen before and afters. I have seen from several places that teh HSR out the box flows in the 268-278 range depending on runners/etc. Thats good flow. But since alot of good heads flow in the 270-290 range+ its nice to make sure your intake flows alot more than the head to make the head the limiting factor
Head can only flow as much as the intake manifold lets through
I'm pretty sure that I'll hit my goal of mid 11's with Lloyd's cam and the 373 upgrade, but im kinda wanting low 11's NA now hahaha. Our cars will NEVER be finished!
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